We found one dictionary that defines the word added sixths:

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1. added sixths: Collins English Dictionary

▸ Words similar to added sixths ▸ Usage examples for added sixths ▸ Idioms related to added sixths ▸ Wikipedia articles (New!) ▸ Words that often appear near added sixths ▸ Rhymes of added sixths ▸ Invented words related to added sixths